<template>
  <div class="home" style="margin: 10px">
    <!--  功能区域  -->
    <div style="margin: 10px 0">
      <el-button type="primary" @click="add" v-if="user.role === '1'">新增</el-button>
      <el-popconfirm
          v-if="user.role === '1'"
          title="确定删除吗？"
          @confirm="deleteBatch"
      >
        <template #reference>
          <el-button type="danger" >批量删除</el-button>
        </template>
      </el-popconfirm>
    </div>

    <!--  搜索区域  -->
    <div style="margin: 10px 0">
      <el-input v-model="search" placeholder="请输入关键字" style="width: 40%" clearable></el-input>
      <el-button type="primary" style="margin-left: 5px" @click="load">查询</el-button>
    </div>

    <!--  表格区域  -->
    <el-table
        :data="tableData"
        border
        stripe
        style="width: 100%"
        @selection-change="handleSelectionChange"
    >
      <!--   多选删除组件   -->
      <el-table-column
          type="selection"
          width="55">
      </el-table-column>

      <!--   定义表头部分   -->
      <el-table-column prop="id" label="id" sortable/>
      <el-table-column prop="name" label="书名"/>
      <el-table-column prop="price" label="价格"/>
      <el-table-column prop="author" label="作者"/>
      <el-table-column prop="createTime" label="创作时间"/>
      <el-table-column label="封面">
        <template #default = "scope">
          <el-image
            style="width: 100px;height: 100px"
            :src="scope.row.cover"
            :preview-src-list="[scope.row.cover]">
          </el-image>
        </template>
      </el-table-column>
      <el-table-column fixed="right" label="操作" width="200">
        <template #default = "scope">
          <el-button  type="primary" @click="handleEdit(scope.row)" v-if="user.role === '1'">编辑</el-button>
          <el-popconfirm confirm-button-text="确认" @confirm ="handleDelete(scope.row.id)" v-if="user.role === '1'" title="确定要删除吗？">
            <template #reference>
              <el-button type="danger">删除</el-button>
            </template>
          </el-popconfirm>
        </template>
      </el-table-column>
    </el-table>

    <!--  分页显示部分  -->
    <div style="margin: 10px 0">
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange" :current-page="currentPage"
                     :page-sizes="[5,10,20]" :page-size="pageSize" background layout="total, sizes, prev, pager, next, jumper"
                     :total="total"/>
      <!--   新增按钮的弹窗   -->
      <el-dialog v-model="dialogVisible" icon="Edit" title="编辑" width="30%">
        <el-form :model="form" label-width="120px">
          <el-form-item label="书名">
            <el-input v-model="form.name" />
          </el-form-item>
          <el-form-item label="价格">
            <el-input v-model="form.price" />
          </el-form-item>
          <el-form-item label="作者">
            <el-input v-model="form.author" />
          </el-form-item>
          <el-form-item label="创作时间">
            <el-date-picker v-model="form.createTime" value-format="YYYY-MM-DD" type="date" style="width: 80%" clearable></el-date-picker>
          </el-form-item>
          <el-form-item label="封面">
            <el-upload ref="upload" action="http://192.168.182.128:8081/files/upload" :on-success = "filesUploadSuccess">
              <el-button type="primary">点击上传</el-button>
            </el-upload>
          </el-form-item>

        </el-form>
        <template #footer>
      <span class="dialog-footer">
        <el-button @click="dialogVisible = false">取消</el-button>
        <el-button type="primary" @click="save">确定</el-button>
      </span>
        </template>
      </el-dialog>
    </div>
  </div>
</template>


<script>
import request from "@/utils/request";

export default {
  name: 'Book',
  components: {

  },
  data() {
    return {
      form: {},
      search: '',
      currentPage: 1,
      pageSize: 10,
      total: 0,
      user:{},
      dialogVisible: false,
      ids:[],
      // 列表中的数据
      tableData: [],
      filesUploadUrl: "http://192.168.182.128:8081/files/upload"
    }
  },
  created() {
    let userStr = sessionStorage.getItem("user") || "{}"
    this.user = JSON.parse(userStr)
    //由于这里的数据是从sessionStorage中获取的是用户可以修改的不可靠
    //因此还是要从后端请求数据
    console.log(this.user.role)
    request.get("/user/" + this.user.id).then(res => {
      if (res.code === '0'){
        this.user = res.data
      }
    })
    this.load()
  },
  methods: {

    //批量删除功能
    deleteBatch() {
      if (!this.ids.length) {
        this.$message.warning("请选择数据！")
        return
      }
      request.post("/book/deleteBatch", this.ids).then(res => {
        if (res.code === '0') {
          this.$message.success("批量删除成功")
          this.load()
        } else {
          this.$message.error(res.msg)
        }
      })
    },



    handleSelectionChange(val){
      this.ids = val.map(v => v.id)
    },



    //上传文件成功将值赋给封面
    filesUploadSuccess(res){
      this.form.cover = res.data
    },



    //编辑
    handleEdit(row) {
      this.form = JSON.parse(JSON.stringify(row))
      this.dialogVisible = true
      this.$nextTick(() =>{
        this.$refs['upload'].clearFiles() //清空上次操作时留下的图片列表的痕迹
      })
    },



    //保存
    save() {
      if (this.form.id){ //更新
        request.put("/book",this.form).then(res =>{
          if (res.code === '0'){
            //更新成功时弹窗给出成功信息
            this.$message({
              type: "success",
              message: "更新成功"
            })
          } else {
            this.$message({
              type: "error",
              message: res.msg
            })
          }
          this.load() // 刷新表格的数据
          this.dialogVisible = false //关闭弹窗
        })
      } else{ // 新增
        request.post("/book",this.form).then(res => {
          if (res.code === '0'){
            //新增成功时弹窗给出成功信息
            this.$message({
              type: "success",
              message: "新增成功"
            })
          } else {
            this.$message({
              type: "error",
              message: res.msg
            })
          }
          this.load() // 刷新表格的数据
          this.dialogVisible = false //关闭弹窗
        })
      }
    },



    //删除
    handleDelete(id){
      console.log(id)
      request.delete("/book/" + id).then(res => {
        if (res.code === '0'){
          //更新成功时弹窗给出成功信息
          this.$message({
            type: "success",
            message: "删除成功"
          })
        } else {
          this.$message({
            type: "error",
            message: res.msg
          })
        }
        this.load() // 刷新表格的数据
      })
    },



    handleSizeChange(pageSize) {
      // 改变每页个数
      this.pageSize = pageSize
      this.load()
    },



    handleCurrentChange(currentPage) {
      // 改变当前页数
      this.currentPage = currentPage
      this.load()
    },



    add() {
      // 打开弹窗添加图书
      this.dialogVisible = true
      // 每次打开弹窗输入后要清空否则影响下次使用
      this.form = {}
      if (this.$refs['upload']){
        this.$refs['upload'].clearFiles() //清空上次操作时留下的图片列表的痕迹
      }
    },



    // 刷新数据
    load(){
      request.get("/book",{
        params:{
          currentPage:this.currentPage,
          pageSize:this.pageSize,
          search:this.search
        }
      }).then(res=>{
        // 后台返回的数据赋值给表格
        this.tableData = res.data.records
        // 后台返回的数据总条数
        this.total = res.data.total
      })
    }

  }

}
</script>

